Armature-core for dynamos and motors



(No Model.)

P.- P. LOOMISf ARMATURB GORE POE DYNAMOS AND MOTORS. No. 415,363. Patented Nov. 19, 1889..

% II/J II Iran/E III 0071113 hubs or collars C 0.

UNITED STATES PATENT OFFICE.

-FRANK. F. LOOMIS, OF AKRON, OHIO.

ARMATURE-CORE FOR DYNAMOS AND MOTORS.

SPECIFICATION forming'part of Letters Patent No. 415,363, dated November 19, 1889.

Serial No. 315,297. (No model.)

To aZZ whom it may concern.-

Be it known that I, FRANK. F. LooMIs, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Cores for Armatures for Dynamo-Electric Machines, of which the following is a specification.

My invention relates to improvements in cores for ring or drum armatures for dynamoelectric machines.

The objects of my invention are to construct a simple and easily-constructed core and to provide improved means for mounting it upon its supporting-shaft.

To this end my invention consists of the peculiar construction, combination, and arran gement of parts hereinafter described, and specifically pointed out in the claims, reference being had to the accompanying drawings, which form a part of this specification.

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is a longitudinal central section of a core for a ring-armature at the line .2 z of Fig. 2; Fig. 2, an end elevation of the same; and Figs. 3 and 4, transverse sections of the same at the lines or 00 and y y, respectively.

A is a hollow iron cylinder, which prefer ably shall be of approximately the proportions shown, on the ends of which are shrunk or otherwise fastened iron rings B B, the outer peripheries of which are the same as that of the proposed armature. In the outer edges of these rings are inserted at proper intervals preferably three pins a, which project outward sufficiently to enter corresponding holes in the arms which project from non-magnetic These collars or hubs are mounted on a shaft D, which is journaled in the dynamo-frame, and they are retained thereon by set-screws c and nuts E, by which means the cylinder A and the rings B B are mounted on the shaft D and revolve therewith. Between the collars B B the cylinder A is wound with a series of coils of iron wire,

which wire is preferably square in cross-section as permitting a more compact winding, and is wound in groups, as F G, which groups are insulated from each other by annular insulating-disks I I and from the cylinder A by non-conducting strips J J. The alternate groups are preferably wound in opposite directions, as illustrated in Figs. 3 and 4, in which the groups F are wound from right to left and the groups G from left to right, the outer peripheries of said groups being alike, and the same with the rings B B. The core thus constructed is wound longitudinally with insulated copper wire in'the usual manner of winding ring-armatures.

The core for a drum-armature is similarly wound, a solid cylinder being substituted for the hollow cylinder A; but as this construction will be obvious to persons skilled in the art no separate View has been given.

I claim as my invention- 1. In a core for armatures for dynamo-electric machines, the combination of a cylinder having end collars, a central shaft, non-magnetic hubs mounted on said shaft. means, as screw-threaded nuts, to retain said hubs, and pins to unite said hubs and cylinder and support the latter, substantially as shown and described.

2. I11 a core for armatures for dynamo-electrio machines, the combination of a supporting-shaft, non-magnetic hubs mounted on said shaft, and means, as screw-threaded nuts, to retain said hubs, and a hollow cylinder supported between said hubs by pins projecting from said hubs and wound with groups of iron Wire, said groups being insulated from said cylinder and from each other, substantially as described.

In testimony that I claim the above I hereunto set my hand.

FRANK. F. LOOMIS.

In presence of-- (J. E. HUMPHREY, C. P. HUMPHREY. 

